The word X originates from Greek Mythology:
Ariadne, the daughter of King Minos of Crete, fell in love with Theseus, a Greek hero who came to Crete to slay the Minotaur who lived in a subterranean Labyrinth. Ariadne gave Theseus a ball of yarn which he unwound as he entered the Labyrinth. This particular instance of Ariadne giving Theseus a ball of yarn marked the use of X in its current meaning. After slaying the Minotaur, Theseus followed the thread back to the entrance of the Labyrinth, rejoined Ariadne, and successfully escaped Crete.
If Hansel and Gretel’s trail of breadcrumbs weren’t eaten by birds, we would have a completely different word for the current meaning of X. Id X.
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